Radial Engineering PRO ISO Stereo Line Isolator +4dB to -10dB with Radial Transformer "Stereo pro to consumer audio interface RCA, 3.5mm and 1/4"" outputs, XLR inputs Variable output control to set optimum levels Transformer isolated to eliminate hum & buzz Applications: Record direct from mixers and mic-preamps Interface +4dB pro-gear with unbalanced inputs Recording interface for laptops and MP3 players Swiss army problem solver and adaptor Cool stuff: Passive design doesn't need power 'Plug & play' easy-to-use anywhere" "RCA, 3.5mm and 1/4"" outputs, XLR inputs" Variable output control to set optimum levels Transformer isolated to eliminate hum & buzz This makes it easy to interface professional audio gear with devices such as computer sound cards, iPods, or -10dB recorders